EP3509773B1 - Method and apparatus for forming a beaded can end - Google Patents
Method and apparatus for forming a beaded can end Download PDFInfo
- Publication number
- EP3509773B1 EP3509773B1 EP18750047.5A EP18750047A EP3509773B1 EP 3509773 B1 EP3509773 B1 EP 3509773B1 EP 18750047 A EP18750047 A EP 18750047A EP 3509773 B1 EP3509773 B1 EP 3509773B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bead
- punch
- assembly
- forming
- blank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000000034 method Methods 0.000 title claims description 38
- 239000011324 bead Substances 0.000 claims description 263
- 239000000463 material Substances 0.000 claims description 50
- 230000015572 biosynthetic process Effects 0.000 claims description 24
- 230000002093 peripheral effect Effects 0.000 claims description 22
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 125000006850 spacer group Chemical group 0.000 description 9
- 230000000977 initiatory effect Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
- B21D13/02—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/06—Stamping using rigid devices or tools having relatively-movable die parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/24—Deep-drawing involving two drawing operations having effects in opposite directions with respect to the blank
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
- B21D51/44—Making closures, e.g. caps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
- B65D17/06—Integral, or permanently secured, end or side closures
- B65D17/08—Closures secured by folding or rolling and pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/12—Cans, casks, barrels, or drums
- B65D1/14—Cans, casks, barrels, or drums characterised by shape
- B65D1/16—Cans, casks, barrels, or drums characterised by shape of curved cross-section, e.g. cylindrical
Definitions
- EP1126939B1 on which for example the preambles of claims 1, 11 and 16 are based, relates to methods and apparatus for forming a beaded can end.
- a can end is formed from sheet material in a single acting press by blanking a workpiece and holding the workpiece between a blanking punch and a draw pad. The periphery of the workpiece is worked between a knockout and a crown ring to contour a crown. A bead punch advances into the workpiece to form a shell extending from the crown.
- a method for forming a can end in a forming press with the steps of independent claim 1 comprises positioning a sheet of material between an upper punch assembly and a fixed base assembly in the forming press; cutting a can end blank from the sheet of material; clamping a peripheral portion of the can end blank; moving the upper punch assembly from a retracted position toward an extended position, and clamping a central portion of the can end blank between an upper panel punch and a lower panel punch to define a central panel section on the can end blank, wherein the central panel section is below an annular inner bead die located adjacent to the lower panel punch on the fixed base assembly; and extending the upper punch assembly subsequent to clamping the central portion of the can end blank to form an initial annular countersink radius next to the peripheral portion of the can end blank, with a substantially undeformed intermediate area extending between the initial annular countersink radius and the annular inner bead die.
- the peripheral portion of the can end blank may be clamped on a crown ring of the fixed base assembly, and the outer bead punch may cooperate with an inner wall of the crown ring to form a generally vertical outer wall of the countersink radius.
- a method for forming a can end in a forming press with the steps of independent claim 11 comprises positioning a sheet of material between an upper punch assembly and a fixed base assembly in the forming press; cutting a can end blank from the sheet of material; clamping a peripheral portion of the can end blank between a crown ring and a knockout ring; providing an upper punch assembly having a plurality annular bead punches and an upper panel punch supported for movement relative to the bead punches; providing a fixed base assembly having a plurality of annular bead dies for cooperating with the bead punches and a lower panel punch; moving the upper punch assembly from a retracted position toward an extended position.
- the bead punch assembly 112 may comprise the outer bead punch 112a, middle bead punch 112b, and inner bead punch 112c formed integrally, i.e., as a single unit, with the positions of the bead punches 112a, 112b, 112c fixed relative to each other.
- the inner bead punch 112c may be located at the same height or slightly above the outer bead punch 112a, and the middle bead punch 112b may be located at a height above both the outer and inner bead punches 112a, 112c, see Fig. 3 .
- the upper panel punch 114 can engage against the center panel portion 130.
- the crown ring 134 is rigidly supported in the lower fixed base assembly 104 and the knockout ring 132 is spring biased downwardly in the upper punch assembly 102.
- the knockout ring 132 can retract into the upper punch assembly 102 following clamping of the crown portion 130B in the crown clamping area 134A and as the upper punch assembly 102 continues to move toward the fixed base assembly 104. Further continued downward movement of the upper punch assembly 102 engages the upper panel punch 114 against a center panel section 131 of the blank 130 to the position shown in Fig. 3 .
- an air pressure is applied to a chamber 107 above the punch piston 106, see Fig. 1 , during the downward stroke of upper punch assembly 102 to bias the upper panel punch 114 downwardly relative to the bead punch assembly 112 throughout the downward stroke of upper punch assembly 102.
- the upper punch assembly 102 may move downward about 0.295 in. (0.749 cm) between the position shown in Fig. 2 and the position shown in Fig. 3 .
- the particular dimensions identified with reference to movement of the tooling in the steps of the forming process described with reference to Figs. 2-9 are provided for exemplary purposes only, and are not intended to be limiting to the invention claimed herein. That is, the dimensions of tooling movement are provided to illustrate a relative degree of movement throughout the forming process, and variations in the particular movement or degree of movement of the tooling can be included within the forming process described herein.
- an intermediate area 130D of the blank 130 spanning between the upper bead punch 112a and the inner bead die 116c comprises a substantially undeformed portion of the blank 130 that is out of engagement with the middle and inner bead punches 112b, 112c and out of engagement with the outer and middle bead dies 116a, 116b.
- the upper punch assembly 102 may move downward about 0.067 in. (0.170 cm) between the position shown in Fig. 3 and the position shown in Fig. 4 .
- the blank 130 can be in engagement with the first bead die 116a, and the outer bead punch 112a can press the material of the blank 130 into a first die space S 1 between the crown ring 134 and the outer bead die 116a, past or below the height of the outer bead die 116a, to form a countersink radius V 1 , also referred to as a chuckwall radius.
- the middle and inner bead punches 112b, 112c can remain out of contact with the intermediate section 130D as the countersink radius V 1 is formed.
- the upper punch assembly 102 may move downward about 0.010 in. (0.025 cm) between the position shown in Fig. 6 and the position shown in Fig. 7 .
- the material of the blank 130 may be drawn across the outer and middle bead dies 116a, 116b, the outer, middle and inner bead punches 112a, 112b, 112c, and the crown ring 134 with downward movement of the upper bead punch assembly 112 to provide material for forming the countersink radius V 1 , and the middle and inner bead valley radii V 2 , V 3 with little or no stretching of the material of the blank 130.
- the can end is formed with successive formation of valley radii wherein initial formation of the valley radii may be staged to occur at different times in the forming process.
- formation of the countersink radius may be initiated first and successive intermediate valley radii may be formed sequentially which, in combination with only providing the upper forming tooling "on air” while the bottom tooling is “on solid” or fixed, results in a reduction in press tonnage required for formation of the can end.
- a bending of the material forming the blank 130 can be performed gradually wherein bending of the material can be accommodated by either pulling additional material from the outer portion 130A of the blank 130 or by a localized thinning of material at the bead radii or valley radii.
- Performing the forming operation as a sequential draping of the material over the tooling of the bead punch assembly 112 and bead die assembly 116, as is illustrated in Figs. 2-9 reduces restriction on movement of the material from the outer portion 130A, such that the material of the blank 130 is pulled inward more readily to reduce the amount of thinning that might otherwise occur.
- the material for forming the bead valley radii and bead radii, and in particular the material of the intermediate section 130D is not substantially stretched but rather is formed with relatively small sequential deformations that thin the material a minimal amount to form the beads, while the center panel section 131 remains clamped at a stationary position.
- the can end formation process described herein may be performed with no more than about 6% material thinning and no or negligible material stretching.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
Description
- The present invention relates to manufacturing methods and to an apparatus for forming metallic can ends, according to the preambles of
claims 1, 11 and 16 respectively, and more particularly to methods and to an apparatus for forming can ends with little or no stretching, and with minimal thinning of material during formation of the can end. - Metallic beverage can ends are designed to have one or more stiffening beads extending around the can end adjacent the circumference or periphery of the can end. These beads are typically defined by interconnected bead radii and bead valley radii alternating with one another in a radial direction of the can end. The beads are formed inward from a countersink radius, or chuckwall radius, and can be located outward from a central panel portion of the can end.
- Beverage can bodies and can ends must be sufficiently strong to withstand high internal pressures and also external forces resulting from shipment and handling. Additionally, they must be manufactured from extremely thin and durable materials to reduce costs of manufacturing and weight of the finished products. These seemingly incompatible requirements of high strength and light weight can be accomplished by aggressively working the thin materials using interacting male and female tool combinations. Unfortunately, aggressive material working can lead to inconsistencies within a given contour or geometry of can ends due to excessive stretching or thinning of material from which the can ends are made. Such inconsistencies resulting during formation may diminish strength and alter other characteristics of the can ends.
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EP1126939B1 , on which for example the preambles ofclaims 1, 11 and 16 are based, relates to methods and apparatus for forming a beaded can end. A can end is formed from sheet material in a single acting press by blanking a workpiece and holding the workpiece between a blanking punch and a draw pad. The periphery of the workpiece is worked between a knockout and a crown ring to contour a crown. A bead punch advances into the workpiece to form a shell extending from the crown. The bead punch bottoms out on a bead die and collapses to a predetermined position to form a plurality of beads adjacent the shell by flowing a portion of the shell to form the beads while shortening the shell to less than specifications for the can end. The bead punch returns to an uncollapsed position during upstroke of the press to extend the shell to be within specifications. - In the present application, techniques for controlling stretching and thinning in formed portions of can ends are illustrated in methods and apparatus for forming can ends from thin stock that exhibit required strength and possess improved consistency.
- In accordance with an aspect of the invention, a method for forming a can end in a forming press with the steps of
independent claim 1 is provided. The method comprises positioning a sheet of material between an upper punch assembly and a fixed base assembly in the forming press; cutting a can end blank from the sheet of material; clamping a peripheral portion of the can end blank; moving the upper punch assembly from a retracted position toward an extended position, and clamping a central portion of the can end blank between an upper panel punch and a lower panel punch to define a central panel section on the can end blank, wherein the central panel section is below an annular inner bead die located adjacent to the lower panel punch on the fixed base assembly; and extending the upper punch assembly subsequent to clamping the central portion of the can end blank to form an initial annular countersink radius next to the peripheral portion of the can end blank, with a substantially undeformed intermediate area extending between the initial annular countersink radius and the annular inner bead die. - The upper punch assembly may be extended to engage an annular first intermediate bead punch against the can end blank and a first intermediate bead valley radius may be initially formed in the intermediate area of the can end blank, and the depth of the countersink radius may be simultaneously increased.
- The upper punch assembly may be further extended to engage an annular second intermediate bead punch against the can end blank and initially form a second intermediate bead valley radius in the intermediate area of the can end blank, wherein the depth of the first intermediate bead valley radius and the countersink radius may be simultaneously increased.
- Forming the initial annular countersink radius may comprise engaging the can end blank with an outer bead punch on the upper punch assembly after an initial engagement of the upper panel punch against the can end blank.
- Initial formation of the annular countersink radius may include upward displacement of the upper panel punch relative to the outer bead punch while the upper panel punch clamps the central panel section to the lower panel punch.
- The peripheral portion of the can end blank may be clamped on a crown ring of the fixed base assembly, and the outer bead punch may cooperate with an inner wall of the crown ring to form a generally vertical outer wall of the countersink radius.
- The upper punch assembly may include an annular outer bead punch, an annular middle bead punch, and an annular inner bead punch, and the fixed base assembly may include an annular outer bead die, an annular middle bead die, and the annular inner bead die, and wherein, subsequent to an initial engagement of the outer bead punch on the can end blank: the undeformed intermediate area of the can end blank may extend in engagement with the outer bead die, the middle bead die and the inner bead die; and the middle bead punch and the inner bead punch may be located spaced from the can end blank.
- The middle bead punch may engage the can end blank prior to an engagement of the inner bead punch on the can end blank.
- The outer bead punch and the inner bead punch may extend downward farther than the middle bead punch.
- Movement of the upper punch assembly to its extended position may complete formation of the can end blank into a can end having a countersink radius, a middle bead valley radius, and an inner bead valley radius, wherein the central panel section may remain clamped between the upper panel punch and the lower panel punch during the entire formation of the beads.
- In accordance with another aspect of the invention, a method for forming a can end in a forming press with the steps of independent claim 11 is provided. The method comprises positioning a sheet of material between an upper punch assembly and a fixed base assembly in the forming press; cutting a can end blank from the sheet of material; clamping a peripheral portion of the can end blank between a crown ring and a knockout ring; providing an upper punch assembly having a plurality annular bead punches and an upper panel punch supported for movement relative to the bead punches; providing a fixed base assembly having a plurality of annular bead dies for cooperating with the bead punches and a lower panel punch; moving the upper punch assembly from a retracted position toward an extended position. In addition, movement of the upper punch assembly comprises: engaging a central portion of the can end blank with the upper panel punch prior to engagement of the can end blank with the bead punches or the bead dies; and subsequently moving the upper punch assembly to clamp the central portion of the can end blank between the upper panel punch and the lower panel punch with the can end blank engaged with a single one of the bead punches and a single one of the bead dies.
- The upper punch assembly may be extended subsequent to clamping the central portion of the can end such that the single one of the bead punches moves the can end blank down into engagement with one or more of the remaining bead dies.
- Subsequent to the can end blank moving into engagement with the one or more of the remaining bead dies, further movement of the upper punch assembly may move the remaining bead punches into engagement with the can end blank.
- The single one of the bead punches may comprise a radially outermost bead punch and the single one of the bead dies may comprise a radially innermost bead die.
- A substantially undeformed intermediate area may extend between the outermost bead punch and the innermost bead die.
- The lower panel punch may be immovably fixed relative to the bead dies.
- In accordance with a further aspect of the invention, an apparatus according to the features of independent claim 16 is provided, the apparatus being for forming a can end from a sheet of material in a single acting press having a fixed base assembly and a movable upper punch assembly. The apparatus comprises a crown ring rigidly supported on the fixed base assembly and having an upper surface defining a contour for a crown of the can end. A knockout ring is carried by the upper punch assembly, the knockout ring being aligned with the crown ring for engaging a workpiece upon movement of the upper punch assembly toward the fixed base assembly to form a crown in a peripheral portion of the workpiece. A plurality of annular bead punches are supported on the upper punch assembly and an upper panel punch is fluidly supported on the upper punch assembly for movement relative to the bead punches. A plurality of annular bead dies and a lower panel punch are supported on the fixed base assembly for cooperating with the bead punches and the upper panel punch, respectively. Movement of the upper punch assembly from a retracted position toward an extended position engages the workpiece between the crown ring and the knockout ring, and positions the upper panel punch in engagement with the workpiece prior to engagement of the workpiece with the bead punches or the bead dies. Subsequent movement of the upper punch assembly clamps the workpiece between the upper panel punch and the lower panel punch with the workpiece engaged with a single one of the bead punches and a single one of the bead dies.
- The upper panel punch may displace into the upper punch assembly during movement of the punch assembly toward the extended position subsequent to clamping the workpiece between the upper panel punch and the lower panel punch.
- The plurality of bead punches on the upper punch assembly may be supported in fixed relation to each other and the upper panel punch may be movable relative to the plurality of bead punches.
- While the specification concludes with claims particularly pointing out and distinctly claiming the present invention, it is believed that the present invention will be better understood from the following description in conjunction with the accompanying Drawing Figures, in which like reference numerals identify like elements, and wherein:
-
Fig. 1 is a schematic sectional view showing a forming press operable in accordance with aspects of the present description illustrating an upper punch assembly of the forming press in a lowered position at the initiation of a blank forming process for forming a can end; -
Fig. 2 is an enlarged schematic sectional view of the forming press ofFig. 1 immediately following clamping of a workpiece between a draw punch and draw pad in preparation for a blanking operation; -
Fig. 3 is an enlarged schematic sectional view showing portions of the forming press ofFig. 1 illustrating clamping engagement of a blank between a knockout ring and a crown ring; -
Fig. 4 is an enlarged schematic sectional view showing portions of the forming press ofFig. 1 immediately following a clamping engagement of the blank between an upper panel punch and a lower panel punch; -
Fig. 5 is an enlarged schematic sectional view showing portions of the forming press ofFig. 1 illustrating an initial step in formation of an outer bead for the can end; -
Fig. 6 is an enlarged schematic sectional view showing portions of the forming press ofFig. 1 illustrating a further downward movement of the upper punch assembly positioning the blank adjacent to the upper bead dies; -
Fig. 7 is an enlarged schematic sectional view showing portions of the forming press ofFig. 1 illustrating a further downward movement of the upper punch assembly to position the blank in engagement with an outer bead die for formation of the outer bead of the can end; -
Fig. 8 is an enlarged schematic sectional view showing portions of the forming press ofFig. 1 illustrating a further downward movement of the upper punch assembly to form a middle bead of the can end; -
Fig. 9 is an enlarged schematic sectional view showing portions of the forming press ofFig. 1 illustrating a further downward movement of the upper punch assembly to form an inner bead of the can end; and -
Fig. 10 is a sectional view of an exemplary can end formed in accordance with aspects of the present description. - In the following detailed description of the preferred embodiment, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration a specific preferred embodiment in which the invention may be practiced. It is to be understood that other embodiments may be utilized and that changes may be made without departing from the scope of the present invention as defined in the appended claims.
- The present application discloses methods and apparatus for forming panels, shells, or can ends so that formed portions of the can ends have controlled thinning to substantially prevent warping, twisting and/or fractures that may occur if thinning is uncontrolled. In accordance with an aspect of the disclosed methods and apparatus, the formed portions of the can ends can be produced with no stretching, or negligible stretching, of the material during the forming process.
- Reference is now made to
Fig. 1 which illustrates a formingpress 100 having a movableupper punch assembly 102 and a lowerfixed base assembly 104. Theupper punch assembly 102 is movable between a retracted position spaced from the fixedbase assembly 104 and an extended position adjacent to the fixedbase assembly 104 at a bottom dead center position of the formingpress 100. Theupper punch assembly 102 includes apunch piston 106 mounted in anupper die shoe 108, and the lowerfixed base assembly 104 includes alower die shoe 110. - A
bead punch assembly 112 is secured in fixed relation to theupper die shoe 108 and includes an annularouter bead punch 112a, an annular middle bead punch (first intermediate bead punch) 112b, and an annular inner bead punch (second intermediate bead punch) 112c.Punch bead spacers 115 may be provided to enable positioning of themiddle bead punch 112b andinner bead punch 112c relative to each other and relative to theouter bead punch 112a. Further, an additionalbead punch spacer 117 may be provided above theouter bead punch 112a to enable positioning the outer, middle, andinner bead punches upper die shoe 108. Alternatively, thebead punch assembly 112 may comprise theouter bead punch 112a,middle bead punch 112b, andinner bead punch 112c formed integrally, i.e., as a single unit, with the positions of the bead punches 112a, 112b, 112c fixed relative to each other. - The
upper punch assembly 102 further includes anupper panel punch 114 that is secured to thepunch piston 106 and supported for movement relative to thebead punch assembly 112. One ormore spacers 119 may be provided between thepunch piston 106 and theupper panel punch 114 to adjust the vertical position of theupper panel punch 114 within theupper die shoe 108. In the illustrated configuration, twospacers 119 of different diameter are illustrated wherein the thickness of one or both of thespacers 119 may be ground to adjust the vertical position of theupper panel punch 114. In an alternative configuration, a single spacer having a stepped diameter could be provided in place of the twospacers 119 illustrated herein. In the illustrated embodiment, theinner bead punch 112c may be located at the same height or slightly above theouter bead punch 112a, and themiddle bead punch 112b may be located at a height above both the outer andinner bead punches Fig. 3 . - The lower
fixed base assembly 104 includes a lower bead die assembly 116 for cooperating with thebead punch assembly 112 during a forming process performed on a workpiece or blank 130 which is cut from a sheet of material in the forming press. The bead dieassembly 116 comprises an annularouter bead die 116a, an annular middle bead die 116b, and an annular inner bead die 116c. Additionally, the lower bead dieassembly 116 includes alower panel punch 118 for cooperating with theupper panel punch 114. - Die
spacers 120 can be provided to position the middle bead die 116b and inner bead die 116c relative to each other and relative to theouter bead die 116a, and a lowerpanel punch spacer 122 can be provided to position the lower panel punch relative to the inner bead die 116c. Alternatively, the lower bead dieassembly 116 may comprise theouter bead die 116a, middle bead die 116b, inner bead die 112c, andlower panel punch 118 formed integrally, i.e., as a single unit, with the positions of the bead dies 116a, 116b, 116c fixed relative to each other and fixed relative to thelower die assembly 116. - As seen in
Fig. 1 , an upper surface of thelower panel punch 118 is located at an elevation or height that is below the height of the inner bead die 116c. Further, in the illustrated embodiment, the middle bead die 116b may be located at a greater height than the inner bead die 116c, and theouter bead die 116a may be located at a greater height than the middle bead die 116b. It should be understood that the heights of the bead punches 112a, 112b, 112c and bead dies 116a, 116b, 116c relative to each other are selected to provide a sequential forming of beads for the can end that facilitate formation of the can end with no or limited stretching of the blank material, as will be described further below. - As shown in
Fig. 1 , theupper punch assembly 102 is moved from the retracted position toward the extended position, and is located adjacent to the fixedbase assembly 104 to cut a can end blank 130 from the sheet or workpiece W. The can end blank 130 is cut from the sheet or workpiece W by a blank or draw punch 124 carried by theupper punch assembly 102, and acut edge 126 carried by the fixedbase assembly 104. An outerperipheral portion 130A of the can end blank 130 is clamped at anouter clamping area 128A between thedraw punch 124 and adraw pad 128 movably supported on the fixedbase assembly 104 of the formingpress 100 so that the can end blank is held in a generally horizontal orientation as shown. Aknockout ring 132 carried by theupper punch assembly 102 is engaged against acrown portion 130B of the blank 130 adjacent to the outerperipheral portion 130A, as can be further seen inFig. 2 . - Referring to
Fig. 3 , during downward movement of theupper punch assembly 102 toward the extended position, theknockout ring 132 moves into association with acrown ring 134 to clamp thecrown portion 130B at acrown clamping area 134A between theknockout ring 132 and thecrown ring 134. Thedraw pad 128 is supported in the fixedbase assembly 104 on an air cushion. - Further downward movement of the draw punch 124 with the
upper punch assembly 102, following clamping at thecrown clamping area 134A, moves theouter clamping area 128A down below thecrown clamping area 134A, such that theperipheral portion 130A is extracted from theouter clamping area 128A. - At substantially the same time or after the
peripheral portion 130A is released from theouter clamping area 128A, theupper panel punch 114 can engage against thecenter panel portion 130. Thecrown ring 134 is rigidly supported in the lowerfixed base assembly 104 and theknockout ring 132 is spring biased downwardly in theupper punch assembly 102. Hence, theknockout ring 132 can retract into theupper punch assembly 102 following clamping of thecrown portion 130B in thecrown clamping area 134A and as theupper punch assembly 102 continues to move toward the fixedbase assembly 104. Further continued downward movement of theupper punch assembly 102 engages theupper panel punch 114 against acenter panel section 131 of the blank 130 to the position shown inFig. 3 . - It may be noted that an air pressure is applied to a
chamber 107 above thepunch piston 106, seeFig. 1 , during the downward stroke ofupper punch assembly 102 to bias theupper panel punch 114 downwardly relative to thebead punch assembly 112 throughout the downward stroke ofupper punch assembly 102. In the illustrated exemplary embodiment, theupper punch assembly 102 may move downward about 0.295 in. (0.749 cm) between the position shown inFig. 2 and the position shown inFig. 3 . It may be understood that the particular dimensions identified with reference to movement of the tooling in the steps of the forming process described with reference toFigs. 2-9 are provided for exemplary purposes only, and are not intended to be limiting to the invention claimed herein. That is, the dimensions of tooling movement are provided to illustrate a relative degree of movement throughout the forming process, and variations in the particular movement or degree of movement of the tooling can be included within the forming process described herein. - Referring to
Fig. 4 , during further downward movement of theupper punch assembly 102 toward the extended position, theupper panel punch 114 is positioned to clamp thecenter panel portion 130C in apanel clamping area 118A between theupper panel punch 114 and thelower panel punch 118 to define a centerpanel valley portion 130C of the blank 130, which substantially corresponds to thecenter panel section 131. At generally the same time as theupper panel punch 114 moves into position to define the centerpanel valley portion 130C, theouter bead punch 112a engages the blank 130 adjacent to thecrown clamping area 134A to partially form thecrown portion 130B around the upper surface of thecrown ring 134 and draw aportion 130A of the outer peripheral portion around thecrown ring 134. - Additionally, as a lower surface of the
upper panel punch 114 moves below the inner bead die 116c, a portion of the blank 130 adjacent to thecenter panel portion 130C is positioned in engagement over the inner bead die 116c. At this stage of the can end formation, anintermediate area 130D of the blank 130 spanning between theupper bead punch 112a and theinner bead die 116c comprises a substantially undeformed portion of the blank 130 that is out of engagement with the middle and inner bead punches 112b, 112c and out of engagement with the outer and middle bead dies 116a, 116b. In the illustrated exemplary embodiment, theupper punch assembly 102 may move downward about 0.067 in. (0.170 cm) between the position shown inFig. 3 and the position shown inFig. 4 . - Referring to
Fig. 5 , during further downward movement of theupper punch assembly 102 toward the extended position, thecenter panel section 131 remains clamped in thepanel clamping area 118A, and theouter bead punch 112a continues to press an outer periphery of theintermediate section 130D downward and draw additional material from the outerperipheral portion 130A of the blank 130 around thecrown ring 134. As thebead punch assembly 112 moves downward, theupper panel punch 114 is displaced upward relative to thebead punch assembly 112, against the air pressure in thechamber 107. Additionally, theouter bead punch 112a can begin a deformation of the material of the blank 130 as an initial step in formation of an annular outer bead for the can end. It may be noted that as material is drawn from the outerperipheral portion 130A, it passes through a die area defined between aninner wall 125 of thedraw punch 124 and anouter wall 135 of thecrown ring 134 to form a generally vertical outer wall for the can end. In the illustrated exemplary embodiment, theupper punch assembly 102 may move downward about 0.010 in. (0.025 cm) between the position shown inFig. 4 and the position shown inFig. 5 . - Referring to
Fig. 6 , during further downward movement of theupper punch assembly 102 toward the extended position, thecenter panel section 131 remains clamped in thepanel clamping area 118A, and theouter bead punch 112a continues to press an outer periphery of theintermediate section 130D downward and draw additional material from the outerperipheral portion 130A of the blank 130 around thecrown ring 134. As thebead punch assembly 112 moves downward, theupper panel punch 114 is displaced further upward relative to thebead punch assembly 112, against the air pressure in thechamber 107. Theouter bead punch 112a moves theintermediate section 130D into contact or closely adjacent to contact with one or both of the outer and middle bead dies 116a, 116b, while the middle and inner bead punches 112b, 112c can remain out of contact with theintermediate section 130D. In the illustrated exemplary embodiment, theupper punch assembly 102 may move downward about 0.010 in. (0.025 cm) between the position shown inFig. 5 and the position shown inFig. 6 . - Referring to
Fig. 7 , during further downward movement of theupper punch assembly 102 toward the extended position, thecenter panel section 131 remains clamped in thepanel clamping area 118A, and theouter bead punch 112a continues to press the outer periphery of theintermediate section 130D downward and draw additional material from the outerperipheral portion 130A of the blank 130 around thecrown ring 134. As thebead punch assembly 112 continues to move downward, theupper panel punch 114 is displaced further upward relative to thebead punch assembly 112, against the air pressure in thechamber 107. At the stage of formation shown inFig. 7 , the blank 130 can be in engagement with thefirst bead die 116a, and theouter bead punch 112a can press the material of the blank 130 into a first die space S1 between thecrown ring 134 and theouter bead die 116a, past or below the height of theouter bead die 116a, to form a countersink radius V1, also referred to as a chuckwall radius. Further, the middle and inner bead punches 112b, 112c can remain out of contact with theintermediate section 130D as the countersink radius V1 is formed. In the illustrated exemplary embodiment, theupper punch assembly 102 may move downward about 0.010 in. (0.025 cm) between the position shown inFig. 6 and the position shown inFig. 7 . - Referring to
Fig. 8 , during further downward movement of theupper punch assembly 102 toward the extended position, thecenter panel section 131 remains clamped in thepanel clamping area 118A, and theouter bead punch 112a continues to press the outer periphery of theintermediate section 130D downward and draw additional material from the outerperipheral portion 130A of the blank 130 around thecrown ring 134. As thebead punch assembly 112 continues to move downward, theupper panel punch 114 is displaced further upward relative to thebead punch assembly 112, against the air pressure in thechamber 107. Themiddle bead punch 112b can press the material of the blank 130 into a second die space S2 between the outer bead die 116a and the middle bead die 116b, past or below the height of theouter bead die 116a, to form a first intermediate or middle bead valley radius V2, and further defining a first bead radius B1 separating the first and second valley radii V1, V2. As the second bead valley radius V2 is formed, the downward movement of theouter bead punch 112a with thebead punch assembly 112 continues to deepen the countersink radius V1. It may be noted that material of the blank 130 may be drawn radially inward across theouter bead die 116a, theouter bead punch 112a, and thecrown ring 134 with downward movement of the upperbead punch assembly 112 to provide material for forming the beads with little or no stretching of the material of the blank 130. In the illustrated exemplary embodiment, theupper punch assembly 102 may move downward about 0.010 in. (0.025 cm) between the position shown inFig. 7 and the position shown inFig. 8 . - Referring to
Fig. 9 , during further downward movement of theupper punch assembly 102 toward the extended position, thecenter panel section 131 remains clamped in thepanel clamping area 118A, and theouter bead punch 112a continues to press the outer periphery of theintermediate section 130D downward and draw additional material from the outerperipheral portion 130A of the blank 130 around thecrown ring 134. As thebead punch assembly 112 continues to move downward, theupper panel punch 114 is displaced further upward relative to thebead punch assembly 112, against the air pressure in thechamber 107. Theinner bead punch 112c can press the material of the blank 130 into a third die space S3 between the middle bead die 116b and the inner bead die 116c, past or below the height of the middle bead die 116b and the inner bead die 116c, to form a second intermediate or inner bead valley radius V3. Forming the inner bead valley radius V3 further coincides with forming a second bead radius B2 separating the middle and inner bead valley radii V2, V3 and forming or completing a third bead radius B3 separating the inner bead valley radius V3 and the centerpanel valley portion 130C. As the inner bead valley radius V3 is formed, the downward movement of the outer andmiddle bead punches bead punch assembly 112 continues to deepen the countersink radius V1 and middle bead valley radius V2. As noted above, the material of the blank 130 may be drawn radially inward as theupper punch assembly 102 moves downward. In particular, the material of the blank 130 may be drawn across the outer and middle bead dies 116a, 116b, the outer, middle andinner bead punches crown ring 134 with downward movement of the upperbead punch assembly 112 to provide material for forming the countersink radius V1, and the middle and inner bead valley radii V2, V3 with little or no stretching of the material of the blank 130. - The forming stage illustrated in
Fig. 9 represents downward movement at or close to the extended position of theupper punch assembly 102, and completes the outerperipheral portion 130A of the blank 130 to a final length defining an outer wall of a crown C of the can end. The crown C has a final contour defined by the upper surface of thecrown ring 134 and is connected to the countersink radius V1 at a verticalouter countersink wall 136 formed between aninner wall 138 of thecrown ring 134 and anouter wall 140 of theouter bead punch 112a, as may be further seen inFig. 10 . In the illustrated exemplary embodiment, theupper punch assembly 102 may move downward about 0.031 in. (0.079 cm) between the position shown inFig. 8 and the position shown inFig. 9 . - It should be understood that although the steps for forming a can end include initiating formation of the middle bead valley radius V2 as a first intermediate bead valley radius following the step of initiating formation of the countersink radius V1, additional aspects of the invention may include a different order of bead valley radius formation. For example, the
bead punch assembly 112 and bead dieassembly 116 may be configured to initiate formation of the inner bead valley radius V3 as the first intermediate bead valley radius followed by initiating formation of the middle bead valley radius V2 as the second intermediate bead valley radius. - From the above description, it may be understood that the can end is formed with successive formation of valley radii wherein initial formation of the valley radii may be staged to occur at different times in the forming process. In particular, formation of the countersink radius may be initiated first and successive intermediate valley radii may be formed sequentially which, in combination with only providing the upper forming tooling "on air" while the bottom tooling is "on solid" or fixed, results in a reduction in press tonnage required for formation of the can end.
- In forming the can end, a bending of the material forming the blank 130 can be performed gradually wherein bending of the material can be accommodated by either pulling additional material from the
outer portion 130A of the blank 130 or by a localized thinning of material at the bead radii or valley radii. Performing the forming operation as a sequential draping of the material over the tooling of thebead punch assembly 112 and bead dieassembly 116, as is illustrated inFigs. 2-9 , reduces restriction on movement of the material from theouter portion 130A, such that the material of the blank 130 is pulled inward more readily to reduce the amount of thinning that might otherwise occur. Hence, it may be understood that throughout the steps described with reference toFigs. 2-9 , the material for forming the bead valley radii and bead radii, and in particular the material of theintermediate section 130D, is not substantially stretched but rather is formed with relatively small sequential deformations that thin the material a minimal amount to form the beads, while thecenter panel section 131 remains clamped at a stationary position. For example, the can end formation process described herein may be performed with no more than about 6% material thinning and no or negligible material stretching. - While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the scope of the invention, which is defined by the appended claims.
Claims (18)
- A method for forming a can end in a forming press (100), the method comprising:positioning a sheet of material between an upper punch assembly (102) and a fixed base assembly (104) in the forming press (100);cutting a can end blank (130) from the sheet of material;clamping a peripheral portion (130A) of the can end blank (130); andmoving the upper punch assembly (102) from a retracted position toward an extended position, and clamping a central portion of the can end blank (130) between an upper panel punch (114) and a lower panel punch (118) to define a central panel section on the can end blank (130), wherein the central panel section is below an annular inner bead die (116c) located adjacent to the lower panel punch (118) on the fixed base assembly (104);characterized in that the method comprises extending the upper punch assembly (102) subsequent to clamping the central portion of the can end blank (130) to form an initial annular countersink radius (V1) next to the peripheral portion of the can end blank (130), with a substantially undeformed intermediate area (130D) extending between the initial annular countersink radius (V1) and the annular inner bead die (116c).
- The method of forming a can end as set forth in claim 1, including extending the upper punch assembly to engage an annular first intermediate bead punch (112b) against the can end blank and initially form a first intermediate bead valley radius (V2) in the intermediate area (130D) of the can end blank, and simultaneously increasing the depth of the countersink radius (V1).
- The method of forming a can end as set forth in claim 2, including further extending the upper punch assembly to engage an annular second intermediate bead punch (112c) against the can end blank and initially form a second intermediate bead valley radius (V3) in the intermediate area (130D) of the can end blank, wherein the depth of the first intermediate bead valley radius (V2) and the countersink radius (V1) is simultaneously increased.
- The method of forming a can end as set forth in claim 1, wherein forming the initial annular countersink radius comprises engaging the can end blank with an outer bead punch (112a) on the upper punch assembly after an initial engagement of the upper panel punch against the can end blank.
- The method of forming a can end as set forth in claim 4, wherein initial formation of the annular countersink radius (V1) includes upward displacement of the upper panel punch (114) relative to the outer bead punch (112a) while the upper panel punch (114) clamps the central panel section to the lower panel punch (118).
- The method of forming a can end as set forth in claim 4, wherein the peripheral portion (130A) of the can end blank is clamped on a crown ring (134) of the fixed base assembly, and the outer bead punch (112a) cooperates with an inner wall (138) of the crown ring (134) to form a generally vertical outer wall (136) of the countersink radius (V1).
- The method of forming a can end as set forth in claim 1, wherein the upper punch assembly (102) includes an annular outer bead punch (112a), an annular middle bead punch (112b), and an annular inner bead punch (112c), and the fixed base assembly (104) includes an annular outer bead die (116a), an annular middle bead die (116b), and the annular inner bead die (116c), and wherein, subsequent to an initial engagement of the outer bead punch (112a) on the can end blank:the undeformed intermediate area (130D) of the can end blank extends in engagement with the outer bead die (116a), the middle bead die (116b) and the inner bead die (116c); andthe middle bead punch (112b) and the inner bead punch (112c) are located spaced from the can end blank.
- The method of forming a can end as set forth in claim 7, wherein the middle bead punch (112b) engages the can end blank prior to an engagement of the inner bead punch (112c) on the can end blank.
- The method of forming a can end as forth in claim 8, wherein the outer bead punch (112a) and the inner bead punch (112c) extend downward farther than the middle bead punch (112b).
- The method of forming a can end as set forth in claim 9, wherein movement of the upper punch assembly to its extended position completes formation of the can end blank into a can end having a countersink radius (V1), a middle bead valley radius (V2), and an inner bead valley radius (V3), wherein the central panel section remains clamped between the upper panel punch (114) and the lower panel punch (118) during the entire formation of the beads.
- A method for forming a can end in a forming press (100), the method comprising:positioning a sheet of material between an upper punch assembly (102) and a fixed base assembly (104) in the forming press;cutting a can end blank (130) from the sheet of material;clamping a peripheral portion (130A) of the can end blank (130) between a crown ring (134) and a knockout ring (132);providing an upper punch assembly (102) having a plurality annular bead punches (112a, 112b, 112c) and an upper panel punch supported for movement relative to the bead punches (112a, 112b, 112c); andproviding a fixed base assembly (104) having a plurality of annular bead dies (116a, 116b, 116c) for cooperating with the bead punches (112a, 112b, 112c) and a lower panel punch (118), wherein the lower panel punch (118) is immovably fixed relative to the bead dies (116a, 116b, 116c);characterized in that the method comprises moving the upper punch assembly (102) from a retracted position toward an extended position, wherein movement of the upper punch assembly (102) comprises:engaging a central portion of the can end blank (130) with the upper panel punch (114) prior to engagement of the can end blank (130) with the bead punches (112a, 112b, 112c) or the bead dies (116a, 116b, 116c); andsubsequently moving the upper punch assembly (102) to clamp the central portion of the can end blank (130) between the upper panel punch (114) and the lower panel punch (118) with the can end blank (130) engaged with a single one of the bead punches (112a, 112b, 112c) and a single one of the bead dies (116a, 116b, 116c).
- The method of forming a can end as set forth in claim 11, including extending the upper punch assembly (102) subsequent to clamping the central portion of the can end such that the single one of the bead punches (112a, 112b, 112c) moves the can end blank down into engagement with one or more of the remaining bead dies (116a, 116b, 116c).
- The method of forming a can end as set forth in claim 12, wherein, subsequent to the can end blank moving into engagement with the one or more of the remaining bead dies (116a, 116b, 116c), further movement of the upper punch assembly (102) moves the remaining bead punches (112a, 112b, 112c) into engagement with the can end blank.
- The method of forming a can end as set forth in claim 11, wherein the single one of the bead punches comprises a radially outermost bead punch (112a) and the single one of the bead dies comprises a radially innermost bead die (116c).
- The method of forming a can end as set forth in claim 14, wherein a substantially undeformed intermediate area (130D) extends between the outermost bead punch (112a) and the innermost bead die (116c).
- Apparatus for forming a can end from a sheet of material in a single acting press (100) having a fixed base assembly (104) and a movable upper punch assembly (102), the apparatus comprising:a crown ring (134) rigidly supported on the fixed base assembly (104) and having an upper surface defining a contour for a crown (130B) of the can end;a knockout ring (132) carried by the upper punch assembly (102), the knockout ring (132) being aligned with the crown ring (134) for engaging a workpiece (130) upon movement of the upper punch assembly (102) toward the fixed base assembly (104) to form a crown (130B) in a peripheral portion of the workpiece (130);a plurality annular bead punches (112a, 112b, 112c) supported on the upper punch assembly (102) and an upper panel punch (114) fluidly supported on the upper punch assembly (102) for movement relative to the bead punches (112a, 112b, 112c);a plurality of annular bead dies (116a, 116b, 116c) and a lower panel punch (118) supported on the fixed base assembly (104) for cooperating with the bead punches (112a, 112b, 112c) and the upper panel punch, respectively;characterized in that the movement of the upper punch assembly (102) from a retracted position toward an extended position engages the workpiece (130) between the crown ring (134) and the knockout ring (132), and positions the upper panel punch (114) in engagement with the workpiece (130) prior to engagement of the workpiece (130) with the bead punches (112a, 112b, 112c) or the bead dies (116a, 116b, 116c), and subsequent movement of the upper punch assembly (102) clamps the workpiece (130) between the upper panel punch (114) and the lower panel punch (118) with the workpiece (130) engaged with a single one of the bead punches(112a, 112b, 112c) and a single one of the bead dies (116a, 116b, 116c).
- The apparatus for forming a can end from a sheet of material in a single acting press as set forth in claim 16, wherein the upper panel punch (114) displaces into the upper punch assembly (102) during movement of the punch assembly toward the extended position subsequent to clamping the workpiece (130) between the upper panel punch (114) and the lower panel punch (118).
- The apparatus for forming a can end from a sheet of material in a single acting press as set forth in claim 17, wherein the plurality of bead punches (112a, 112b, 112c) on the upper punch assembly are supported in fixed relation to each other and the upper panel punch (114) is movable relative to the plurality of bead punches (112a, 112b, 112c).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/825,154 US10946432B2 (en) | 2017-11-29 | 2017-11-29 | Method and apparatus for forming a beaded can end |
PCT/US2018/042855 WO2019108269A1 (en) | 2017-11-29 | 2018-07-19 | Method and apparatus for forming a beaded can end |
Publications (2)
Publication Number | Publication Date |
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EP3509773A1 EP3509773A1 (en) | 2019-07-17 |
EP3509773B1 true EP3509773B1 (en) | 2020-01-29 |
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EP18750047.5A Active EP3509773B1 (en) | 2017-11-29 | 2018-07-19 | Method and apparatus for forming a beaded can end |
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US (1) | US10946432B2 (en) |
EP (1) | EP3509773B1 (en) |
JP (1) | JP6728533B2 (en) |
KR (1) | KR102177383B1 (en) |
CN (1) | CN110099760B (en) |
AU (1) | AU2018308962B2 (en) |
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CN110328278B (en) * | 2019-08-14 | 2020-06-23 | 哈尔滨工业大学 | Large thin-wall curved surface part forming device and method |
CN111421042A (en) * | 2020-03-19 | 2020-07-17 | 武汉萨尔笛模具科技有限公司 | Bidirectional drawing forming method |
CN117531888B (en) * | 2024-01-09 | 2024-03-22 | 常州日恒通用航空有限公司 | Indentation device for gear machining |
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US3868919A (en) | 1973-12-06 | 1975-03-04 | Aluminum Co Of America | Method and apparatus for forming easy opening container walls |
US4571978A (en) | 1984-02-14 | 1986-02-25 | Metal Box P.L.C. | Method of and apparatus for forming a reinforced can end |
US4955223A (en) | 1989-01-17 | 1990-09-11 | Formatec Tooling Systems, Inc. | Method and apparatus for forming a can shell |
DE3916665A1 (en) | 1989-05-23 | 1990-11-29 | Haar Maschbau Alfons | DEVICE FOR PRODUCING COVERS OR SIMILAR ITEMS FROM METAL SHEET |
US5187966A (en) * | 1989-12-11 | 1993-02-23 | Sollac | Method and device for drawing containers of frustoconical shape and a container drawn thereby |
FR2660220B1 (en) | 1990-04-03 | 1995-02-24 | Lorraine Laminage | PROCESS AND DEVICE FOR FORMING A RELIEF PART ON A SHEET OF SHEET AND PRODUCT OBTAINED ACCORDING TO THIS PROCESS. |
GB9112783D0 (en) * | 1991-06-13 | 1991-07-31 | Cmb Foodcan Plc | Can ends |
US5857374A (en) | 1993-03-12 | 1999-01-12 | Stodd; Ralph P. | Method and apparatus for forming a can shell |
US5823040A (en) * | 1997-05-02 | 1998-10-20 | Stodd; Ralph P. | Method and apparatus for forming a can shell |
US6079249A (en) | 1998-11-02 | 2000-06-27 | Alfons Haar Inc. | Methods and apparatus for forming a beaded can end |
US6561004B1 (en) | 1999-12-08 | 2003-05-13 | Metal Container Corporation | Can lid closure and method of joining a can lid closure to a can body |
US6702538B1 (en) * | 2000-02-15 | 2004-03-09 | Crown Cork & Seal Technologies Corporation | Method and apparatus for forming a can end with minimal warpage |
US6419110B1 (en) | 2001-07-03 | 2002-07-16 | Container Development, Ltd. | Double-seamed can end and method for forming |
US6658911B2 (en) * | 2001-09-25 | 2003-12-09 | Sequa Can Machinery, Inc. | Method and apparatus for forming container end shells |
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GB201118284D0 (en) | 2011-10-21 | 2011-12-07 | Crown Packaging Technology Inc | Can end |
ES2586705T3 (en) | 2013-09-20 | 2016-10-18 | Crown Packaging Technology Inc | Canned end production |
US9527127B2 (en) * | 2014-05-05 | 2016-12-27 | Alfons Haar, Inc. | Method and apparatus for forming a can end with controlled thinning of formed portions of the can end |
-
2017
- 2017-11-29 US US15/825,154 patent/US10946432B2/en active Active
-
2018
- 2018-07-19 KR KR1020197006187A patent/KR102177383B1/en active IP Right Grant
- 2018-07-19 DK DK18750047.5T patent/DK3509773T3/en active
- 2018-07-19 HU HUE18750047A patent/HUE051743T2/en unknown
- 2018-07-19 WO PCT/US2018/042855 patent/WO2019108269A1/en unknown
- 2018-07-19 JP JP2019506670A patent/JP6728533B2/en active Active
- 2018-07-19 MX MX2019001916A patent/MX2019001916A/en unknown
- 2018-07-19 CN CN201880003493.0A patent/CN110099760B/en active Active
- 2018-07-19 EP EP18750047.5A patent/EP3509773B1/en active Active
- 2018-07-19 ES ES18750047T patent/ES2778696T3/en active Active
- 2018-07-19 AU AU2018308962A patent/AU2018308962B2/en active Active
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2019
- 2019-02-11 CL CL2019000347A patent/CL2019000347A1/en unknown
- 2019-02-13 EC ECSENADI201910713A patent/ECSP19010713A/en unknown
- 2019-02-20 CO CONC2019/0001506A patent/CO2019001506A2/en unknown
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JP6728533B2 (en) | 2020-07-22 |
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CN110099760B (en) | 2021-02-05 |
JP2020504009A (en) | 2020-02-06 |
KR102177383B1 (en) | 2020-11-12 |
CO2019001506A2 (en) | 2019-08-30 |
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HUE051743T2 (en) | 2021-03-29 |
US20190160517A1 (en) | 2019-05-30 |
CL2019000347A1 (en) | 2019-10-18 |
MX2019001916A (en) | 2019-10-30 |
US10946432B2 (en) | 2021-03-16 |
WO2019108269A1 (en) | 2019-06-06 |
BR112019005786A2 (en) | 2019-08-20 |
CN110099760A (en) | 2019-08-06 |
AU2018308962A1 (en) | 2019-06-13 |
EP3509773A1 (en) | 2019-07-17 |
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